Autotests crashing when importing the native macOS style

When running the

qtdeclarative/tests/auto/quickcontrols/controls/basic/tst_basic (or any of the other styles) and manually setting the style with QQuickStyle::setStyle("macOS"), it will crash just before running the tst_combobox. Looks like the culprit is the native style import line 

import QtQuick.NativeStyle as NativeStyle

If this is removed, the crash is not reproducible.
Happens when running all the other non-native styles tests. Not reproducible on Windows, with the native Windows style. Crash report attached.